Screen



Sept. 21' 1926, 1,600,792

J. BLAND SCREEN v Filed Nov. 28. 1924 2 Sheets-Sheet 1 Sept. 21 1926. 1,600,792

J. BLAND SCREEN- Filed Nov. 28, 1924 zsneets-sheet 2 Invenzor i ES JOHN BLANnw-or oinmuafo; ritnmors.

ATEN our lscannu. s

v I ffThis invention relates 'to' a' vibratory sible taken up in the screen itself and not transmitted; through to the foundation ofthe screen or through to the building in whichitislocated. Otherobjects will appear from time to time throughoutthe spec1-' fication and claims.-

i diagrammatically in the f In the particular form illustrated herewithtwo screens are mounted one above the other. They "operate together vibrating toward and away from each other, and thus to a very large degree .the vibration is taken upwithin thescreens themselves and is not transmitted'through the support and 01111". dation. v

My invention is illustrated more or less accompanying drawing, wherein: Y

Figure 1 is a side elevation with parts In section;

Figure 2 is a vertical cross section taken on the line 2-2 of Figure 1;

. e ably 'pi'votally frameD.

- Figure 3 is a view similar to Figure 1 showing a modified form;

Figure 4 i s-an end view looking at the up- 1 per end of the screenwith thefeeding device omitted; I

Figure 5 is an end view of the lower end of'the screen.

Like parts are indicated by like characters {A is a foundation on which the screen is mounted; B B are screenframes,each of which carries a screen cloth or other'screening surface B Each of. the screens is prefmounted atone end on a supportC, which supportis carried froma foundation A. At its otherend each of the screens-is mounted for movement. in a sup ich inQthe'. form shown is a spring arrangement, a pair off..,ls hafts -Drnnning throughear's,;D -D ...on the screen and-exs tendingrintola member D31 carried by the About the shaft or-rod is a pairofhelicalv springsflf one resting upon the member I D? and bearing-uponthe lowerrear D and support-in the lower screen, between, the two screens and the other being supporting the upper screen It will be obviousthat many othertypesof screens and mountings might I is.-'a lower'screen box and I ;aifiiiieutnfhua tbv hpr 2a, 1924. "seri l 1 m; 752,521.

be used without departing from the spirit of my invention. 7 v

\ Mounted between the screens, and in the form here shown, adjacent their upper ends is a pair of spring members E. While I have shown two of these members, a different number might be used. Mounted on these spring members E is a shaft F. This shaft carries one or more fly wheels F They may be out of balance in themselves or they may be provided with one or more, vadjustable weights F At one end of the shaft-is a belt pulley F or other driving means G. By means of the belt G the motor drives and the shaft upon which it is mounted, the shaft being preferably" mounted toone side of the spr1ng.n1embers,in bearings H H.

Although I have shown an operative'device, still it will be changes might be made in size, shape and arrangement of parts without departing materially from the spirit of my invention; and I wish therefore that my showing be taken as in asense diagrammatic.

In the form shown in Figures 3, .4and 5 an .upper screen'box. The upper box is at each end preferably supported from the lower box. At its forward end the lower box is carried on a pair of threaded rods J J. Upon these rods are mounted adjusting nuts J J 'Exsupporting arm-J This arm is" perforated Mounted on the framework A or at any other suitable point is a motor the belt pulley F obvious that many at eachend and the threadedrods J pass I through these perforations. the lower end of the screen ,may be raised and lowered by adjustment of the nuts J. The lower end of the upper screen member is supported from the member J 2 by means of blocks J; v 1

At its upper end the lower screen is-supported on aspring member K. This =mem-' ber is provided with a thickened Icentr'al The height of portion-.K which engages the bottom' of the I 7 box 1. At its two outer ends, the-spring member K is carried on columns or supports a K which egtend upward fromthefoundm tion support A. The spring member E.

shown and "described'in connection with the form shown-in Figure 1 is the same as; that shown in these fi res. The lowere'n dfof the spring E is astened to the box I' and the u er end is fastened to the boxjI The out-0 ialance fly wheels, the pulley and driving belt are the same in each form ofv the invention.

L is a hopper or other feeding device by means of which material is deposited on 'the upper end of the upper screen. L is a chute adapted to receive material from the upper screen, and L is a similar chute adapted tonreceive material from the lower screen.

M is a multiple feeding device provided with a separate chute adapted to deliver material to' each screen within the screening machine.

The use and operation of my invention are as follows:

Wheh the shaft is rotated, being out of balance, it vibrates. This vibration moves athe central portion of the spring members laterally,-thus bending the spring. When it bends, its vertical height is of course reduced and the screens thus move together. As the rotation of the shaft continues the spring member straightens again and thus becomes elongated and )moves the screen frames apart. This as rotation of the unbalanced shaft continues, the s ring member which carries it 'is constantly bent and unbent and each time its length is reduced and then increased again. Thus the screen frames are toward and away from each other, each having practically the same'amplitude of vibration but each balancing the other. Thus the vibration incident to the operation of the screen is taken up within t e screen itself and is not transmitted away elsewhere through the screen support or foundation. I

I'claim:

1. In combination in a vibratory screen two screens held against longitudinal movement, and means for vibrating them toward and away from each otherin balanced relation. L

2. In combination in a vibratory screen two screens held against longitudinal movement attached to each other, and means for movin them toward and away from each other, n balanced relation through an equal a amplitude.

- 3. In combination two screens held against longitudinal .movement and a flexible element connecting them, and means for impgrting transverse vibration to it said means mg active upon the flexible element intermediate the screens.

4. In combination two sc reens, aspring member joiningthe two, in'combination with means for imparting transverse vibration to sald sprmg member whereby the screens are caused to move toward and away from each other.

to said spring member whereby the screens are caused to move toward and away from each "other simultaneously and through an equal amplitude.

6. In combination a pair of screens one 5. In combination two screens, a spring being supported and means for supporting 1 the other screen from'it, said means including a spring member joining the two, means for imparting transverse vibration to said spring member whereby the screens are caused to reciprocate toward and away from each other.

7. In combination a pair of screens one being supported and means for supporting the other screen from it, said means including a spring member joining the two, means for imparting transverse vibration to said spring member whereby. the screens are caused to reciprocate toward and away from each other simultaneously and through an equal amplitude. I

8. In a screening device a pair of frames in which ismounted screen means, a vertical elementof spring material attached at each end-of said frames, means for vibrating said element of spring material attached at each of said frames, means for vibrating said spring member with a generally transverse amplitude whereby reciprocation of the two screen means is effected.

10. In combination in a vibratory screen a pair of screens one mounted above the -other, and means for vibrating them vertically toward and from each other.

11. In combination in. a vibratory screen a pair of screens one mounted above the other and means for vibratingthem toward and from each other in balanced relation.' 12. In combination a pair of screens attached to each other and one'mounted above the other, and means for moving them toward and from each other simultaneously and-through an equal amplitude.

13. In combination' a'pa'ir of screens one mounted above the other and means for moving them toward and from each other, said means including a flexible member at tached toeach of said screens in combination with means for imparting transverse vibramounted above the other, and means for moving them toward and from each other in balanced-relation, said means including a flexible member attached to each of said screens, in combination with means for imvibration to said member, whereby the said movement of the screens is brought about.

16. In combination, a pair of screens mounted one above the other, the lower one being supported and free to have slight vertical--"movement, means for supporting the upper screen from the lower, said means includin a spring member fastened at one end on t e lower member and at the other on the upper member, in combination with means for imparting transverse vibration to said spring member whereby the screens are caused to reciprocate toward and away from each other.

17. In combination a plurality of screens mounted for movement, means for moving them in balanced motion toward and away from each other, said means including a member joining said screens and carrying a part adapted for unbalanced rotary move- 3 ment whereby the member is flexed and the screens are moved toward and away from each other with said flexure.

18.- In combination two screens one above the other each mounted at one end for piv- 40 otal movement and supported at the other end .for generally vertical movement, and a pair of vertical members each attached at each end to one of the screens intermediate its ends, in combination with an unbalanced member mounted on said spring members, means for driving the same whereby the spring members are laterally flexed, their vertical height being alternately reduced and increased so as to move the two screens alternately toward and away, from each other, in balanced motion.

19. In combination two screens one above the other and means transposing horizontal thrust into vertical movement to vibrate the screens, said means including a flexible member generally vertical and attached to the two, and an out-of-balanee part carried: by said flexible member and adapted to bend the said vertical member laterally said means being active on the flexible element intermediate the screens.

Signed at Chicago, county of Cook and State of Illinois, this 12th day of November 1924.

JOHN BLAND. 

